Add support for pausing and resuming NPC pathing during and after interaction

[ghost]

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Fixes #2695 and cleans up some styling in the related NPC scripts. Adds optional bool to CLuaBaseEntity::clearPath() to pause AI ticks for pathing, and adds additional binding as CLuaBaseEntity::continuePath() which will clear the previously paused flag.

pathfind.lua patrol function has been reduced, and will cycle through points in the path list.